/**
 * Chess Hub Layout System
 * Navigation, responsive layout, and structural styles
 */

/* ============================================================================
   NAVIGATION STYLES
   ============================================================================ */

nav.main-nav {
    background: var(--color-card);
    box-shadow: var(--shadow-sm);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 250px;
    padding: var(--spacing-md) 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

nav.main-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
}

nav.main-nav li {
    margin: 0;
}

nav.main-nav a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    border-left: 4px solid transparent;
}

nav.main-nav a:hover {
    background-color: var(--color-bg);
    color: var(--color-primary);
}

nav.main-nav a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

nav.main-nav a.active {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

/* ============================================================================
   NAVIGATION FOOTER
   ============================================================================ */

.menu-footer {
    border-top: 1px solid #eee;
    padding: var(--spacing-sm) 0;
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.menu-footer-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    border-left: 4px solid transparent;
}

.menu-footer-item:hover {
    background-color: var(--color-bg);
    color: var(--color-primary);
}

.menu-footer-item:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

.menu-footer-item.active {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

/* ============================================================================
   LOGOUT BUTTON
   ============================================================================ */

.menu-logout {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-danger);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    border-left: 4px solid transparent;
}

.menu-logout:hover {
    background-color: var(--color-bg);
    color: var(--color-danger-hover);
}

.menu-logout:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

/* ============================================================================
   MENU ICON
   ============================================================================ */

.menu-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-icon svg {
    width: 20px;
    height: 20px;
}

/* ============================================================================
   PAGE HEADER & CONTEXTUAL ACTIONS
   ============================================================================ */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-md);
}

.page-header h2 {
    margin-bottom: 0;
}

.page-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.danger-zone {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* ============================================================================
   TABLET LAYOUT (769px – 1024px): icon-only sidebar
   ============================================================================ */

@media (min-width: 769px) and (max-width: 1024px) {
    .bottom-tab-bar,
    .bottom-more-panel,
    .bottom-more-backdrop {
        display: none !important;
    }

    nav.main-nav {
        width: var(--nav-sidebar-collapsed-width);
        overflow: visible;
    }

    nav.main-nav .menu-label {
        display: none;
    }

    nav.main-nav a {
        justify-content: center;
        gap: 0;
        padding: var(--spacing-sm);
        border-left: 3px solid transparent;
        position: relative;
    }

    nav.main-nav a:hover::after {
        content: attr(data-label);
        position: absolute;
        left: calc(var(--nav-sidebar-collapsed-width) + 8px);
        top: 50%;
        transform: translateY(-50%);
        background: var(--color-text);
        color: var(--color-card);
        padding: 4px 10px;
        border-radius: var(--border-radius-sm);
        font-size: var(--font-size-xs);
        white-space: nowrap;
        z-index: 200;
        pointer-events: none;
    }

    .menu-footer-item,
    .menu-logout {
        justify-content: center;
        gap: 0;
        padding: var(--spacing-sm);
        border-left: 3px solid transparent;
        position: relative;
    }

    .menu-footer-item .menu-label,
    .menu-logout .menu-label {
        display: none;
    }

    .menu-footer-item:hover::after,
    .menu-logout:hover::after {
        content: attr(data-label);
        position: absolute;
        left: calc(var(--nav-sidebar-collapsed-width) + 8px);
        top: 50%;
        transform: translateY(-50%);
        background: var(--color-text);
        color: var(--color-card);
        padding: 4px 10px;
        border-radius: var(--border-radius-sm);
        font-size: var(--font-size-xs);
        white-space: nowrap;
        z-index: 200;
        pointer-events: none;
    }

    .menu-icon {
        width: 24px;
        height: 24px;
    }

    .menu-icon svg {
        width: 24px;
        height: 24px;
    }

    .main-content {
        margin-left: var(--nav-sidebar-collapsed-width);
    }
}

/* ============================================================================
   DESKTOP LAYOUT (min-width: 1025px): full sidebar
   ============================================================================ */

@media (min-width: 1025px) {
    .bottom-tab-bar,
    .bottom-more-panel,
    .bottom-more-backdrop {
        display: none !important;
    }

    nav.main-nav {
        width: var(--nav-sidebar-width);
    }

    nav.main-nav .menu-label {
        display: inline;
    }

    .main-content {
        margin-left: var(--nav-sidebar-width);
    }
}

/* ============================================================================
   MOBILE LAYOUT (max-width: 768px)
   ============================================================================ */

@media (max-width: 768px) {
    nav.main-nav {
        display: none;
    }

    .main-content {
        margin-top: 0;
        margin-left: 0;
        padding-bottom: calc(var(--nav-bottom-bar-height) + env(safe-area-inset-bottom, 0px));
    }

    .container {
        margin: 0;
        padding: var(--spacing-md);
    }

}

/* ============================================================================
   GRADIENT HEADER + KEBAB MENU (mobile & tablet, max-width: 1024px)
   ============================================================================ */

@media (max-width: 1024px) {
    .page-header {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-sm);
        background: var(--color-primary-gradient);
        margin: calc(-1 * var(--spacing-md)) calc(-1 * var(--spacing-md)) var(--spacing-md);
        padding: var(--spacing-sm) var(--spacing-md);
        border-bottom: none;
        position: relative;
    }

    .page-header h2 {
        margin-bottom: 0;
        color: white;
        font-size: var(--font-size-lg);
        flex: 1;
    }

    /* Back button — moved into header row by JS, icon-only */
    .page-header .btn-back {
        background: rgba(255, 255, 255, 0.2);
        border: 1px solid rgba(255, 255, 255, 0.4);
        color: white;
        font-size: var(--font-size-base);
        width: 36px;
        height: 36px;
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        overflow: hidden;
    }

    /* Hide the text, show SVG chevron via pseudo-element */
    .page-header .btn-back {
        font-size: 0;
    }

    .page-header .btn-back::before {
        content: '';
        display: block;
        width: 18px;
        height: 18px;
        background-color: white;
        -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='15 18 9 12 15 6'/%3E%3C/svg%3E");
        mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='15 18 9 12 15 6'/%3E%3C/svg%3E");
        -webkit-mask-size: contain;
        mask-size: contain;
        -webkit-mask-repeat: no-repeat;
        mask-repeat: no-repeat;
        -webkit-mask-position: center;
        mask-position: center;
    }

    .page-header .btn-back:hover {
        background: rgba(255, 255, 255, 0.35);
        transform: none;
        box-shadow: none;
    }

    /* Kebab trigger button — injected via JS into .page-header */
    .page-actions-trigger {
        display: none;
        background: rgba(255, 255, 255, 0.2);
        border: 1px solid rgba(255, 255, 255, 0.4);
        border-radius: var(--border-radius-sm);
        color: white;
        font-size: 20px;
        width: 36px;
        height: 36px;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        flex-shrink: 0;
        line-height: 1;
        font-family: inherit;
        padding: 0;
        transition: background var(--transition-fast);
    }

    .page-actions-trigger:hover,
    .page-actions-trigger:focus {
        background: rgba(255, 255, 255, 0.35);
        outline: none;
    }

    .page-header:has(.page-actions-trigger) .page-actions-trigger {
        display: flex;
    }

    /* Dropdown menu */
    .page-actions {
        position: absolute;
        top: 100%;
        right: var(--spacing-md);
        left: auto;
        width: auto;
        min-width: 180px;
        z-index: 900;
        background: var(--color-card);
        border: 1px solid var(--color-border-light);
        border-radius: var(--border-radius-md);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-xs) 0;
        flex-direction: column;
        gap: 0;
        display: none;
    }

    .page-actions.open {
        display: flex;
    }

    .page-actions .btn {
        display: block;
        width: 100%;
        text-align: left;
        background: none;
        border: none;
        border-radius: 0;
        color: var(--color-text);
        font-size: var(--font-size-sm);
        font-weight: var(--font-weight-normal);
        padding: var(--spacing-sm) var(--spacing-md);
        box-shadow: none;
        white-space: nowrap;
    }

    .page-actions .btn:hover {
        background: var(--color-bg);
        color: var(--color-primary);
        transform: none;
        box-shadow: none;
    }

    .page-actions .btn-danger {
        color: var(--color-danger) !important;
        background: none !important;
        border: none !important;
    }

    .page-actions .btn-danger:hover {
        background: var(--color-bg) !important;
        color: var(--color-danger-hover) !important;
    }
}

/* Tablet: correct the bleed margin to match wider container padding */
@media (min-width: 769px) and (max-width: 1024px) {
    .page-header {
        margin-left: calc(-1 * var(--spacing-lg));
        margin-right: calc(-1 * var(--spacing-lg));
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }
}

/* ============================================================================
   GRID SYSTEM
   ============================================================================ */

.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Responsive grid adjustments */
@media (max-width: 768px) {
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .grid-auto {
        grid-template-columns: 1fr;
    }
}

/* ============================================================================
   FLEXBOX UTILITIES
   ============================================================================ */

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-row {
    flex-direction: row;
}

.flex-wrap {
    flex-wrap: wrap;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-end {
    justify-content: flex-end;
}

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

/* ============================================================================
   WELCOME MESSAGE STYLES
   ============================================================================ */

.welcome-message {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

@media (max-width: 480px) {
    .welcome-message {
        font-size: var(--font-size-xl);
    }
}

/* ============================================================================
   WATCHLIST LAYOUT
   ============================================================================ */

.watchlist-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .watchlist-container {
        flex-direction: row;
    }

    .watchlist-form {
        flex: 1;
        margin-bottom: 0 !important;
    }

    .watchlist-list {
        flex: 1;
    }
}

.watchlist-form {
    padding: var(--spacing-md);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-lg);
}

.watchlist-form h3 {
    margin-top: 0;
}

/* Small scroll margin on mobile for visual breathing room */
@media (max-width: 768px) {
    [id^="event-"] {
        scroll-margin-top: 16px;
    }
}

/* ============================================================================
   BOTTOM TAB BAR (Mobile only)
   ============================================================================ */

.bottom-tab-bar {
    display: none; /* Hidden by default; shown only via mobile media query */
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--nav-bottom-bar-height);
    background: var(--color-card);
    border-top: 1px solid var(--color-border-light);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
    z-index: 800;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
    justify-content: space-around;
    align-items: stretch;
}

.bottom-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    gap: 3px;
    padding: var(--spacing-xs) 4px;
    color: var(--color-text-lighter);
    text-decoration: none;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    min-width: 44px;
    min-height: 44px;
}

.bottom-tab:hover,
.bottom-tab:focus {
    color: var(--color-primary);
    text-decoration: none;
    outline: none;
}

.bottom-tab:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
    border-radius: var(--border-radius-sm);
}

.bottom-tab.active {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
}

.bottom-tab-icon {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bottom-tab-icon svg {
    width: 22px;
    height: 22px;
}

.bottom-tab-label {
    font-size: 10px;
    line-height: 1;
    letter-spacing: 0.01em;
}

/* ============================================================================
   BOTTOM MORE PANEL
   ============================================================================ */

.bottom-more-panel {
    display: none;
    position: fixed;
    bottom: var(--nav-bottom-bar-height);
    left: 0;
    right: 0;
    z-index: 850;
    background: var(--color-card);
    border-top: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.12);
    max-height: 70vh;
    overflow-y: auto;
}

.bottom-more-panel.open {
    display: block;
    animation: slideUp var(--transition-normal) ease-out;
}

.bottom-more-panel-inner {
    padding: var(--spacing-sm) 0 var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.bottom-more-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.bottom-more-item:hover,
.bottom-more-item:focus {
    background-color: var(--color-bg);
    color: var(--color-primary);
    text-decoration: none;
}

.bottom-more-item.active {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    background-color: var(--color-bg-light);
}

.bottom-more-item-danger {
    color: var(--color-danger);
}

.bottom-more-item-danger:hover {
    color: var(--color-danger-hover);
}

.bottom-more-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: var(--spacing-xs) 0;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
}

.bottom-more-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 840;
    animation: fadeIn var(--transition-fast) ease-out;
}

.bottom-more-backdrop.open {
    display: block;
}

/* Show bottom tab bar only on mobile */
@media (max-width: 768px) {
    .bottom-tab-bar {
        display: flex;
    }
}